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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_asio.reference.buffer_copy.overload2"></a><a class="link" href="overload2.html" title="buffer_copy (2 of 2 overloads)">buffer_copy
        (2 of 2 overloads)</a>
</h4></div></div></div>
<p>
          Copies a limited number of bytes from a source buffer sequence to a target
          buffer sequence.
        </p>
<pre class="programlisting">template&lt;
    typename <a class="link" href="../MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>,
    typename <a class="link" href="../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>&gt;
std::size_t buffer_copy(
    const MutableBufferSequence &amp; target,
    const ConstBufferSequence &amp; source,
    std::size_t max_bytes_to_copy);
</pre>
<h6>
<a name="boost_asio.reference.buffer_copy.overload2.h0"></a>
          <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload2.parameters"></a></span><a class="link" href="overload2.html#boost_asio.reference.buffer_copy.overload2.parameters">Parameters</a>
        </h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">target</span></dt>
<dd><p>
                A modifiable buffer sequence representing the memory regions to which
                the bytes will be copied.
              </p></dd>
<dt><span class="term">source</span></dt>
<dd><p>
                A non-modifiable buffer sequence representing the memory regions
                from which the bytes will be copied.
              </p></dd>
<dt><span class="term">max_bytes_to_copy</span></dt>
<dd><p>
                The maximum number of bytes to be copied.
              </p></dd>
</dl>
</div>
<h6>
<a name="boost_asio.reference.buffer_copy.overload2.h1"></a>
          <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload2.return_value"></a></span><a class="link" href="overload2.html#boost_asio.reference.buffer_copy.overload2.return_value">Return
          Value</a>
        </h6>
<p>
          The number of bytes copied.
        </p>
<h6>
<a name="boost_asio.reference.buffer_copy.overload2.h2"></a>
          <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload2.remarks"></a></span><a class="link" href="overload2.html#boost_asio.reference.buffer_copy.overload2.remarks">Remarks</a>
        </h6>
<p>
          The number of bytes copied is the lesser of:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <code class="computeroutput">buffer_size(target)</code>
            </li>
<li class="listitem">
              <code class="computeroutput">buffer_size(source)</code>
            </li>
<li class="listitem">
              <code class="computeroutput">max_bytes_to_copy</code>
            </li>
</ul></div>
<p>
          This function is implemented in terms of <code class="computeroutput">memcpy</code>, and consequently
          it cannot be used to copy between overlapping memory regions.
        </p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
      M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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